Using a mangrove is sort of like having caulerpa in your tank. It is natural filtration for the tank. The real problem with them is the set-up. You have to have plenty of room for the mangrove to grow and get light, while giving the tank enough light. They grow with roots in the water, and the trunk/leaves above water. Most people wedge them in live rock or sand. One way to do it is to set up a small auxillary tank that just has water flowing through it from the tank, and set it up in a window, or with more lighting. If you live in a warm climate, you could even put the auxillary tank outside so that it would get real sunlight, but that is a plumbing nightmare. Mangroves are sanctuaries for a lot of fish, and even sharks when they are young. They get protection from the sea birds and larger fish.
Sonny
[ May 30, 2001: Message edited by: Sonny ]